/Engine/Source/Runtime/Core/Public/Containers/Map.h
ATMapBasespecialization that allows multiple values to be associated with each key.
template<typename KeyType, typename ValueType, typename SetAllocator, typename KeyFuncs> class TMultiMap : public [TSortableMapBase< KeyType, ValueType, SetAllocator, KeyFuncs >](API\Runtime\Core\Containers\TSortableMapBase)